Methods of forming pluralities of capacitors

ABSTRACT

A method of forming a plurality of capacitors includes providing a plurality of capacitor electrodes comprising sidewalls. The plurality of capacitor electrodes are supported at least in part with a retaining structure which engages the sidewalls, with the retaining structure comprising a fluid previous material. A capacitor dielectric material is deposited over the capacitor electrodes through the fluid previous material of the retaining structure effective to deposit capacitor dielectric material over portions of the sidewalls received below the retaining structure. Capacitor electrode material is deposited over the capacitor dielectric material through the fluid previous material of the retaining structure effective to deposit capacitor electrode material over at least some of the capacitor dielectric material received below the retaining structure. Integrated circuitry independent of method of fabrication is also contemplated.

TECHNICAL FIELD

This invention relates to methods of forming pluralities of capacitors,and to integrated circuitry.

BACKGROUND OF THE INVENTION

Capacitors are one type of component which is commonly used in thefabrication of integrated circuits, for example in DRAM circuitry. Atypical capacitor is comprised of two conductive electrodes separated bya non-conducting dielectric region. As integrated circuitry density hasincreased, there is a continuing challenge to maintain sufficiently highstorage capacitance despite typical decreasing capacitor area. Theincrease in density of integrated circuitry has typically resulted ingreater reduction in the horizontal dimension of capacitors as comparedthe vertical dimension. In many instances, the vertical dimension ofcapacitors has increased.

One manner of forming capacitors is to initially form an insulativematerial within which a capacitor storage node electrode is formed. Forexample, an array of capacitor electrode openings for individualcapacitors is typically fabricated in such insulative capacitorelectrode-forming material, with a typical insulative electrode-formingmaterial being silicon dioxide doped with one or both of phosphorus andboron. The capacitor electrode openings are typically formed by etching.However, it can be difficult to etch the capacitor electrode openingswithin the insulative material, particularly where the openings aredeep.

Further and regardless, it is often desirable to etch away most if notall of the capacitor electrode-forming material after individualcapacitor electrodes have been formed within the openings. Such enablesouter sidewall surfaces of the electrodes to provide increased area, andthereby increased capacitance for the capacitors being formed. However,the capacitor electrodes formed in deep openings are typicallycorrespondingly much taller than they are wide. This can lead totoppling of the capacitor electrodes either during the etch to exposethe outer sidewall surfaces, during transport of the substrate, and/orduring deposition of the capacitor dielectric layer or outer capacitorelectrode layer. Our U.S. Pat. No. 6,667,502 teaches provision of abrace or retaining structure intended to alleviate such toppling.

While the invention was motivated in addressing the above identifiedissues, it is in no way so limited. The invention is only limited by theaccompanying claims as literally worded, without interpretative or otherlimiting reference to the specification, and in accordance with thedoctrine of equivalents.

SUMMARY

The invention comprises methods of forming pluralities of capacitors,and comprises integrated circuitry independent of method of fabrication.In one implementation, a method of forming a plurality of capacitorsincludes providing a plurality of capacitor electrodes comprisingsidewalls. The plurality of capacitor electrodes is supported at leastin part with a retaining structure which engages the sidewalls, with theretaining structure comprising a fluid previous material. A capacitordielectric material is deposited over the capacitor electrodes throughthe fluid previous material of the retaining structure effective todeposit capacitor dielectric material over portions of the sidewallsreceived below the retaining structure. Capacitor electrode material isdeposited over the capacitor dielectric material through the fluidprevious material of the retaining structure effective to depositcapacitor electrode material over at least some of the capacitordielectric material received below the retaining structure.

In one implementation, a method of forming a plurality of capacitorsincludes depositing a first material over a substrate. A fluid previousmaterial is deposited over the first material, with the first materialbeing selectively etchable relative to the fluid previous material. Aplurality of spaced capacitor electrode openings is formed into thefirst and fluid previous materials. A plurality of capacitor electrodesis formed within the openings. After forming the plurality of capacitorelectrodes, an etching fluid is flowed through the fluid previousmaterial effective to selectively etch first material relative to thefluid previous material and effective to expose outer lateral sidewallsof the capacitor electrodes below the fluid previous material. After theselective etch, capacitor dielectric material and capacitor electrodematerial are deposited over at least some of the outer lateral sidewallsbelow the fluid previous material exposed by the selective etch.

In one implementation, integrated circuitry comprises a plurality ofspaced, elongated and upright capacitor electrodes received over asubstrate and supported at least in part by a sidewall retainingstructure. The sidewall retaining structure comprises a fluid previousmaterial.

In one implementation, integrated circuitry comprises a plurality ofspaced, elongated and upright capacitor electrodes received over asubstrate and supported at least in part by a sidewall retainingstructure. The sidewall retaining structure comprises at least one ofnanowhiskers and nanotubes.

Other implementations and aspects are contemplated.

BRIEF DESCRIPTION OF THE DRAWINGS

Preferred embodiments of the invention are described below withreference to the following accompanying drawings.

FIG. 1 is a diagrammatic cross section of a substrate fragment inprocess in accordance with an aspect of the invention.

FIG. 2 is a view of the FIG. 1 substrate at a processing step subsequentto that shown by FIG. 1.

FIG. 3 is a view of the FIG. 2 substrate at a processing step subsequentto that shown by FIG. 2.

FIG. 4 is a view of the FIG. 3 substrate at a processing step subsequentto that shown by FIG. 3.

FIG. 5 is a view of the FIG. 4 substrate at a processing step subsequentto that shown by FIG. 4.

FIG. 6 is a diagrammatic top plan view of the FIG. 5 substrate.

FIG. 7 a view of the FIG. 6 substrate at a processing step subsequent tothat shown by FIG. 6.

FIG. 8 is a view of the FIG. 5 substrate at a processing step subsequentto that shown by FIG. 5.

FIG. 9 is a view of the FIG. 8 substrate at a processing step subsequentto that shown by FIG. 8.

FIG. 10 is a diagrammatic cross section of an alternate embodimentsubstrate fragment in process in accordance with an aspect of theinvention.

FIG. 11 is a diagrammatic cross section of another alternate embodimentsubstrate fragment in process in accordance with an aspect of theinvention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

This disclosure of the invention is submitted in furtherance of theconstitutional purposes of the U.S. Patent Laws “to promote the progressof science and useful arts” (Article 1, Section 8).

Integrated circuitry and methods of forming pluralities of capacitors inaccordance with exemplary preferred embodiments of aspects of theinvention are described with reference to FIGS. 1-11. Referringinitially to FIG. 1, a wafer fragment is indicated generally withreference numeral 10, and in one preferred implementation comprises asemiconductor substrate. In this document, “semiconductive substrate” or“semiconductor substrate” is defined to mean any construction comprisingsemiconductive material, including, but not limited to, bulksemiconductive materials such as a semiconductive wafer (either alone orin assemblies comprising other materials thereon), and semiconductivematerial layers (either alone or in assemblies comprising othermaterials). The term “substrate” refers to any supporting structure,including, but not limited to, the semiconductive substrates describedabove. By way of example only, substrate fragment 10 is depicted ascomprising some insulator layer 12 having a plurality of conductivecontact plugs 14, 15 and 16 formed therein for electrical connectionwith respect to capacitor electrodes of a plurality of capacitors beingformed, as will be apparent from the continuing discussion. Insulativematerial 12 would overlie other substrate material (not shown), forexample bulk monocrystalline silicon, semiconductor-on-insulatorcircuitry, or other substrate material (of course including one or aplurality of materials) whether existing or yet-to-be developed. Furtherand by way of example only, an etch stop layer (not shown) might bereceived over constructions 12/14/15/16, as a part of material 12,and/or proximate the upper portions of constructions 14/15/16.Conductive plugs 14, 15 and 16 will comprise one or more conductivematerials including, for example and by way of example only,conductively doped semiconductive material. Material 12 might compriseany suitable insulator material, for example one or more silicondioxides, silicon nitrides, and/or other materials, and of coursewhether existing or yet-to-be developed. Substrate 12/14/15/16,isexemplary only, and any substrate is contemplated.

A first material 18 has been deposited over substrate 12/14/15/16. Firstmaterial 18 might be conductive, insulative or semiconductive, with aninsulative material being preferred. By way of example only, exemplarypreferred materials include silicon dioxides, for example doped silicondioxides, and including boron and phosphorus-doped silicon dioxides(i.e., PSG, BSG, and/or BPSG, and spin-on-glasses). An exemplarypreferred thickness range for layer 18 is from 5,000 Angstroms to 10,000Angstroms.

In one implementation, a fluid previous material 20 has been depositedover first material 18, and preferably on first material 18 (with “on”in this document meaning in at least some direct physical contacttherewith). An exemplary preferred thickness range for fluid previousmaterial 20 is from 500 Angstroms to 1,000 Angstroms. In oneimplementation, fluid previous material 20 is characterized by beingdifferent from first material 18 and such that first material 18 isselectively etchable relative to fluid previous material 20. In thecontext of this document, a material which is selectively etchablerelative to another requires capability of a selective etch rate of atleast 10:1 of removal rate of the one material relative the anothermaterial.

Further in the context of this document, a “fluid previous material” isany material through which a fluid (or course, including reactive gases)can be caused indiscriminately to flow without any required patterningor selective deposit of such material over a substrate to enable suchflow therethrough (although such might selectively deposit, or besubsequently patterned). Such fluid previous material might beinherently fluid previous as-deposited, or rendered fluid previous afterdeposition such that fluid can flow through such material. However, afluid previous material herein does not include a material which is notfluid previous as-deposited but subsequently allows fluid flow only upona subsequent patterning of a mask followed by subsequent etch of allunmasked portions such that fluid permeability therethrough results onlyfrom fluid flow around patterned islands or patterned isolated regionsof such material. By way of example only, exemplary preferred fluidprevious materials comprise cellular solids, for example comprising anassembly of prismatic or polyhedral cells having solid edges and facespackaged together to fill space. For example, such cellular solidmaterial might comprise a honeycomb or comprise a foam and include, byway of example only, cellular metals, cellular ceramics, aluminum andother metal foams, glasses, polymers, etc. Further and regardless, inone preferred implementation, the fluid previous material is porous, andeven more preferably nanoporous. In the context of this document, “nano”as a word prefix denotes average size on the order of less than or equalto 100 nanometers. Accordingly, a “nanoporous” material has overallaverage pore size of 1000 Angstroms or less. Exemplary preferred fluidprevious materials are low k materials, and as well silk fibroinmaterial, and porous SiLK™ available from Dow Chemical.

In one preferred implementation, fluid previous material 20 comprisesnanowhiskers, with “nanowhiskers” being synonymous with and common tonanowires and nanorods. Such are nano-scale in diameter, can reach tensof microns in length, and can be grown from a variety of differentmaterials, as known by people of skill in the art. By way of exampleonly, exemplary nanowhisker material includes Si₃N₄, Si, Ge, SiC, B₄C,GaN, B, TiO_(x), and metal carbides. Further by way of example only, thefluid previous material might comprise nanotubes, by way of example onlycarbon nanotubes. Of course, the fluid previous material might comprisea combination of nanowhiskers and nanotubes, and/or combinations of theabove variously stated materials, and other materials. For example andby way of example only, one preferred manner of providing nanowhiskersand/or nanotubes would be to provide one or both of nanowhiskers andnanotubes within a spin-on-glass solution. Such solution would bedeposited over first material 18. Such solution would be solidified intoan exemplary material 20 comprising spin-on-glass and one or both ofnanowhiskers and nanotubes.

Further and regardless, fluid previous material 20 will effectivelydefine or have fluid passageways essentially extending therethrough toallow fluid to pass from one side of material 20 to the other. By way ofexample only, such are diagrammatically depicted with numerals 21 inFIG. 1. Also by way of example only, such might comprise interconnectedpores or other small interconnected chambers or channels whichserpentine from one surface of material 20 to the other. Further,collectively such may be of substantially common or varying opencross-sectional shape and dimensions across material 20, and/or ofcommon or varying open cross-sectional shape of an individual passageway21. Such can be substantially vertically oriented or perpendicularrelative to the expanse of material 20 as diagrammatically shown. In onepreferred implementation, at least a majority of such fluid passagewayswithin fluid previous material 20 have average open cross-sectionaldimensions for fluid flow therethrough which are no greater than 400Angstroms, and in one preferred embodiment no greater than 200Angstroms. Preferably, at least the same majority of fluid passagewayswithin fluid previous material 20 have average open cross-sectionaldimensions of at least 50 Angstroms. By way of example only, exemplarypreferred ranges for said open cross-sectional dimensions are from 100Angstroms to 400 Angstroms, from 100 Angstroms to 300 Angstroms, andfrom 100 Angstroms to 200 Angstroms.

Still referring to FIG. 1, a second material 22 has been deposited overfluid previous material 20, and preferably on fluid previous material 20as shown. Second material 22 is preferably characterized as beingselectively etchable relative to fluid previous material 20, and therebydifferent therefrom. First material 18 and second material 22 might bethe same (meaning identical composition) or different materials. Furtherfor example if different, such might both comprise oxides, for exampleany combinations of doped or undoped oxides including PSG, BSG, BPSG,and spin-on-glasses, by way of example only. Further of course by way ofexample only, materials 18 and 22 might comprise the same oxide. Anexemplary preferred thickness range for second material 22 is from 5,000Angstroms to 15,000 Angstroms. An exemplary preferred compositethickness range for materials 18, 20 and 22 in combination in FIG. 1 isfrom 10,000 Angstroms to 25,000 Angstroms. Further and regardless,second material 22 might fill at least some portion of some of fluidpassageways 21, might fill substantially all of at least some of fluidpassageways 21, or substantially fill all of at least a majority ofpassageways 21 (not shown).

Referring to FIG. 2, a plurality of spaced capacitor electrode openings24, 26 and 28 have been formed into first, fluid previous, and secondmaterials 18, 20 and 22, respectively. An exemplary preferred techniquefor the same is by photolithographic patterning and subsequentanisotropic chemical etching. Of course in the depicted preferredimplementation, etching chemistry will likely need to be changed atleast twice when switching from etching material 22 to etching material20, and again when subsequently etching material 18. Regardless, it islikely (but not required) that the number of passageways/pores/etc.intermediate adjacent of the openings might be greater in number thanthat shown in the drawings, with three being shown between adjacent ofthe openings for clarity in the figures.

Referring to FIG. 3, a plurality of capacitor electrodes 30, 32 and 34have been formed within openings 24, 26 and 28. In the depictedpreferred embodiment, individual of such capacitor electrodesrespectively comprise a respective container shape. By way of exampleonly, an exemplary preferred material for capacitor electrodes 30, 32and 34 is conductively doped polysilicon. An exemplary manner of formingthe same is by polysilicon deposition followed by maskless chemicalmechanical polishing to form the depicted isolated capacitor electrodes30, 32 and 34. Such are depicted as having sidewalls 35 and 37, withsidewalls 37 comprising inner container sidewalls and sidewalls 35comprising outer lateral sidewalls. Of course and by way of exampleonly, but less preferred, openings 24, 26 and 28 might be completelyfilled with capacitor electrode material such that an individualelectrode is more of a filled-in pillar shape than a container shape,and perhaps void of inner container sidewalls 37. Further andaccordingly in the depicted example, at least sidewalls 35 of capacitorelectrodes 30, 32 and 34 are depicted as including portions receivedboth above and below fluid previous material 20.

Referring to FIG. 4, second material 22 has been etched selectivelyrelative to fluid previous material 20 effective to expose outer lateralsidewalls 35 of capacitor electrodes 30, 32 and 34 received above fluidprevious material 20.

Referring to FIG. 5, an etching fluid has been flowed through fluidprevious material 20 effective to selectively etch first material 18relative to fluid previous material 20 and effective to expose outerlateral sidewall 35 of capacitor electrodes 30, 32 and 34 received belowfluid previous material 20. Of course if first material 18 and secondmaterial 22 are the same or at least capable of being etched with thesame chemistry selectively relative to fluid previous material 20, theprocessing of FIG. 5 could be a continuing of the etching of FIG. 4, forexample utilizing the same etching chemistry and etching fluid, and forexample in a single common continuous etching step. In one preferredmethodical aspect of the invention, fluid previous material 20 supportscapacitor electrodes 30, 32 and 34 upright during the selective etch ofat least first material 18.

In one implementation of an aspect of the invention, a method of forminga plurality of capacitors comprises providing a plurality of capacitorelectrodes comprising sidewalls. Such plurality of capacitor electrodesare supported at some point at least in part with a retaining structurewhich engages the sidewalls and comprises a fluid previous material. Forexample and by way of example only, FIG. 5 depicts such an exemplaryretaining structure in the form of remnant material 20. Such retainingstructure 20 in the depicted embodiment is formed of a single layer ofmaterial. Of course, multiple layers of materials might be utilizedwhether contacting one another or not. For example and by way of exampleonly, the retaining structure might comprise multiple spaced layers ofmaterial 20. Further by way of example only, the preceding discussionwith reference to FIGS. 1-4 provides only exemplary methods of formingsuch plurality of capacitor electrodes and supporting such at least inpart with a retaining structure which engages (not necessarily directlycontacting) the capacitor electrode sidewalls. However, the structure ofFIG. 5, or any other structure as just so stated, in a method ofsupporting with a retaining structure as just so stated are alsocontemplated.

As described above, fluid previous material 20 might be inherently fluidprevious as-deposited, or rendered fluid previous after deposition. Forexample and by way of example only, any of the above preferredmaterials, for example foams, honeycombs and/or other materials, mightbe deposited in a manner which provides fluid permeability therethroughimmediately upon formation. Alternately by way of example only,processing might be provided subsequently to a deposited material 20 torender it fluid previous. For example and by way of example only, asuitably thin silicon nitride or other layer might be physicallybombarded with ions or suitably small solid material to createindiscriminate perforations (for example, much like bullet holes)through material 20 to render such material indiscriminately fluidprevious while retaining continuity of material as a continuouspreferred retaining structure or support in the preferred processing asdescribed above.

Further and regardless, the invention contemplates an increasing ofdegree of fluid permeability of at least some of the fluid previousmaterial from its as-deposited state. In one exemplary implementation,such might be done to different degrees relative to different regions.For example in one aspect, the invention contemplates increasing, fromthe as-deposited state, the degree of fluid permeability of firstregions of fluid previous material that are spaced farther from thesidewalls of the capacitor electrodes as compared to second regions offluid previous material that are spaced closer to the capacitorelectrode sidewalls. By way of example only, such is depicted withreference to FIGS. 6 and 7. FIG. 6 diagrammatically depicts a top viewof FIG. 5 showing an exemplary degree of porosity and/or fluidpassageway density and average diameter of fluid previous material 20as-deposited. Such can be considered as depicting exemplary secondregions 40 of fluid previous material that are spaced more proximate orcloser to sidewalls 35 of the capacitor electrodes as compared to firstregions 42 which are comparatively spaced further from sidewalls 35 ofthe capacitor electrodes.

FIG. 7 depicts subsequent processing whereby fluid passageways 21 withinregions 42 have been widened on average as compared to fluid passageways21 within regions 40 on average, thereby increasing the degree of fluidpermeability of material 20 within first regions 42 as compared tosecond regions 40. An exemplary manner of producing the FIG. 7construction as compared to that of FIG. 6 is by suitable plasmaetching, which will tend to inherently preferentially widen pores orpassageways spaced further from sidewalls 35 of adjacent structures thanthose which are placed closer to such structures.

Referring to FIG. 8, a capacitor dielectric material 50 has beendeposited over at least some of outer lateral sidewalls 35 above andbelow fluid previous material 20. In one preferred implementation,capacitor dielectric material 50 has at least been deposited overcapacitor electrodes 30, 32 and 34 through fluid previous material 20 ofthe FIG. 5 depicted retaining structure 20 effective to depositcapacitor dielectric material 50 at least over portions of the capacitorsidewalls which are received below the retaining structure. Furtherlikely, unless deposition conditions were selected that would beselective to not deposit material 50 onto retaining structure/fluidprevious material 20, capacitor dielectric material 50 would alsodeposit onto material 20, and most likely within the fluid passagewayseffectively formed therethrough, and as shown. An exemplary preferredmaterial 50 is aluminum oxide, with an exemplary preferred thickness formaterial 50 being 40 Angstroms. Minimum passageway size in material 20is preferably selected to be greater than two times the depositionthickness of material 50 at least to preclude occlusion of suchpassageways with the depositing capacitor dielectric material to enablesuch material to deposit onto sidewalls of the electrodes below fluidprevious material 20. For example, and by way of example only, apreferred minimum open cross-dimension for passageways 21 for a 40Angstrom thick capacitor dielectric layer 50 is 120 Angstroms. Of coursealternately by way of example only, non-uniform minimum cross-dimensionfluid passageways might be provided in fluid previous material 20.Further for example and by way of example only and with respect to theFIG. 7 depiction, deposited capacitor dielectric material 50 might blockor occlude fluid permeability in at least a majority, if not all, ofsecond regions 40 and not do so in at least a majority, and perhaps innone, of first regions 42.

Referring to FIG. 9, capacitor electrode material 55 has been depositedover at least some of outer lateral sidewalls 35 above and below fluidprevious material 20, and accordingly in one preferred implementation atleast over at least some of capacitor dielectric material 50 receivedbelow retaining structure 20. Material 55 will ultimately be conductive,and may constitute the same or different material(s) from that of firstcapacitor electrodes 30, 32 and 34. Second capacitor electrode material55 might be patterned to form individual second capacitor electrodes forthe depicted first capacitor electrodes, or alternately by way ofexample only comprise a single common capacitor electrode for all of thedepicted capacitors, as is common in DRAM circuitry for example. Furtherand regardless, retaining structure/fluid previous material 20 might ormight not remain as part of a finished integrated circuitry constructionincorporating the plurality of capacitors, with such being depicted asremaining as part of such construction in FIG. 9.

The above exemplary preferred embodiment depicts retaining structure 20in FIG. 5, for example, as not being received within container openingsof the preferred container shapes. By way of example only in a lesserpreferred embodiment, the invention contemplates providing of theretaining structure within container openings of a container shape. Forexample and by way of example only, FIG. 10 depicts an alternateembodiment substrate fragment 10 a as compared to that depicted in FIG.5. Like numerals from the first-described embodiment are utilized whereappropriate, with differences being indicated with the suffix “a” orwith different numerals. FIG. 10 depicts a retaining structure/fluidprevious material 20 a having portions received within the depictedcontainer electrodes 30, 32 and 34. Typically, such would preferably beprovided, at least in part, after forming capacitor electrodes 30, 32and 34.

The above-described preferred embodiments also depict the formation ofboth of first and second materials 18 and 22. By way of example only,FIG. 11 depicts an alternate embodiment substrate fragment 10 b. Likenumerals from the first-described embodiments are utilized whereappropriate, with differences being indicated with the suffix “b” orwith different numerals. FIG. 11 depicts a processing and constructionvoid of second material 22, whereby a thicker first layer 18 b has beenprovided prior to the deposition of a fluid previous material/retainingstructure 20 b.

Aspects of the invention also contemplate integrated circuitryindependent or regardless of the above-described methods of fabrication.In one implementation, such integrated circuitry comprises a pluralityof spaced, elongated and upright first capacitor electrodes receivedover a substrate and supported at least in part by a sidewall retainingstructure. By way of example only, capacitor electrodes 30, 32 and 34are an exemplary depiction of preferred such capacitor electrodes.Further by way of example only in such exemplary implementation,retaining structure 20 is an exemplary such sidewall retainingstructure. In such implementation, the sidewall retaining structurecomprises a fluid previous material. Preferred materials and otherattributes are otherwise as described above with all the respectivedescribed and depicted embodiments.

Aspects of the invention also contemplate methods of forming a pluralityof capacitors independent or regardless of the use of fluid previousmaterials or layers. In one exemplary such implementation and aspect,such an implementation comprises depositing a first material over asubstrate. By way of example only, all aspects associated with firstmaterial 18/18 b described above apply. A support material comprising atleast one of nanotubes and nanowhiskers is deposited over the firstmaterial, and whereby the first material is selectively etchablerelative to the support material and, as just stated, independent ofwhether the support material is fluid previous. Exemplary preferrednanotube and nanowhisker material and attributes are otherwise asdescribed above.

A plurality of spaced capacitor electrode openings is formed into thefirst and support materials and a plurality of capacitor electrodes isformed within the openings, for example as described above. Afterforming the plurality of capacitor electrodes, the first material isetched selectively relative to the support material effective to exposethe outer lateral sidewalls of the capacitor electrodes below thesupport material and leaving at least some of such support material atleast in part supporting the plurality of capacitors, for example asdescribed in the above embodiments and and/but independent of whetherthe support material is fluid previous. Capacitor dielectric materialand capacitor electrode material are thereafter deposited over at leastsome of the outer lateral sidewalls below the support material exposedby the etching. Such a method in one aspect also contemplates theutilization of first and second materials below and above, respectively,the support material as described in the above exemplary preferredembodiments and independent of whether the support material is fluidprevious.

Further in one implementation, the invention contemplates integratedcircuitry independent or regardless of the presence of fluid previousmaterial. In such implementation, such integrated circuitry comprises aplurality of spaced, elongated and upright capacitor electrodes receivedover a substrate and supported at least in part by a sidewall retainingstructure where such structure comprises at least one of nanowhiskersand nanotubes independent of fluid permeability through nanowhiskerand/or nanotube material. Preferred attributes are otherwise as describeabove, by way of example only.

In compliance with the statute, the invention has been described inlanguage more or less specific as to structural and methodical features.It is to be understood, however, that the invention is not limited tothe specific features shown and described, since the means hereindisclosed comprise preferred forms of putting the invention into effect.The invention is, therefore, claimed in any of its forms ormodifications within the proper scope of the appended claimsappropriately interpreted in accordance with the doctrine ofequivalents.

1. A method of forming a plurality of capacitors, comprising: providinga plurality of capacitor electrodes comprising sidewalls; supporting theplurality of capacitor electrodes at least in part with a retainingstructure which engages the sidewalls, the retaining structurecomprising a fluid previous material having plural fluid passageways;depositing a capacitor dielectric material over the capacitor electrodesthrough the fluid previous material of the retaining structure effectiveto deposit capacitor dielectric material over portions of the sidewallsreceived below the retaining structure; and depositing capacitorelectrode material over the capacitor dielectric material through thefluid previous material of the retaining structure effective to depositcapacitor electrode material over at least some of the capacitordielectric material received below the retaining structure.
 2. Themethod of claim 1 wherein individual of the capacitor electrodescomprises a container shape.
 3. The method of claim 2 wherein theretaining structure is not received within container openings of thecontainer shape, and said sidewalls comprise outer lateral sidewalls. 4.The method of claim 2 wherein the retaining structure is received withincontainer openings of the container shape.
 5. The method of claim 1wherein the sidewalls of the capacitor electrodes include portionsreceived above the retaining structure.
 6. The method of claim 1 whereinthe supporting structure comprises depositing the fluid previousmaterial, the fluid impervious material being inherently fluid previousas-deposited.
 7. The method of claim 1 wherein the supporting structurecomprises depositing the fluid perilous material, and further comprisingincreasing degree of fluid permeability of at lent some of the fluidprevious material from its as-deposited state.
 8. The method of claim 7comprising increasing, from as-deposited state, degree of fluidpermeability of first regions of fluid previous material that are spacedfarther from the sidewalls as compared to second regions of fluidprevious material that are spaced closer to the sidewalls.
 9. The methodof claim 8 wherein the capacitor dielectric material deposits onto theretaining structure, the capacitor dielectric material blocking fluidpermeability in at least a majority of the second regions but not in amajority of the first regions.
 10. The method of claim 1 wherein atleast a majority of the fluid passageways within the fluid previousmaterial have average open cross sectional dimensions no greater than400 Angstroms.
 11. The method of claim 1 wherein at least a majority ofthe fluid passageways within the fluid previous material have averageopen cross sectional dimensions no greater than 200 Angstroms.
 12. Themethod of claim 1 wherein at least a majority of the fluid passagewayswithin the fluid previous material have average open cross sectionaldimensions of from 50 Angstroms to 400 Angstroms.
 13. The method ofclaim 1 wherein at least a majority of the fluid passageways within thefluid previous material have average open cross sectional dimensions offrom 100 Angstroms to 300 Angstroms.
 14. The method of claim 1 whereinthe capacitor dielectric material deposits onto the retaining structure.15. The method of claim 1 wherein the capacitor electrode materialdeposits onto the retaining structure.
 16. The method of claim 1 whereinthe retaining structure remains as part of a finished integratedcircuitry construction incorporating the plurality of capacitors. 17.The method of claim 1 wherein the fluid previous material comprises acellular solid.
 18. The method of claim 17 wherein the cellular solidcomprises a honeycomb.
 19. The method of claim 17 wherein the cellularsolid comprises a foam.
 20. The method of claim 1 wherein the fluidprevious material is porous.
 21. The method of claim 20 wherein thefluid previous material is nanoporous.
 22. The method of claim 20wherein the fluid previous material is low k.
 23. The method of claim 1wherein the fluid previous material comprises nanowhiskers.
 24. Themethod of claim 1 wherein the fluid previous material comprisesnanotubes.
 25. The method of claim 1 wherein the fluid perilous materialcomprises a spin-on-glass having nanowhiskers received therein.
 26. Themethod of claim 1 wherein the fluid previous material comprises aspin-on-glass having nanotubes received therein.
 27. A method of forminga plurality of capacitors, comprising: providing a plurality ofcapacitor electrodes comprising sidewalls, portions of the sidewallsbeing received above and below the retaining structure; supporting theplurality of capacitor electrodes at least in part with a depositedretaining structure which engages the sidewalls, the retaining structurecomprising a fluid previous material comprising plural fluid passagewaysand which is inherently fluid previous as-deposited, at least a majorityof the fluid passageways within the fluid previous material havingaverage open cross sectional dimensions no greater than 400 Angstroms;depositing a capacitor dielectric material over the capacitor electrodesthrough the fluid previous material of the retaining structure effectiveto deposit capacitor dielectric material over portions of the sidewallsreceived below the retaining structure, the capacitor dielectricmaterial depositing onto the retaining structure; and depositingcapacitor electrode material over the capacitor dielectric materialthrough the fluid previous material of the retaining structure effectiveto deposit capacitor electrode material over at least some of thecapacitor dielectric material received below the retaining structure,the retaining structure remaining as part of a finished integratedcircuitry construction incorporating the plurality of capacitors. 28.The method of claim 27 wherein at least a majority of the fluidpassageways within the fluid previous material have average open crosssectional dimensions of from 100 Angstroms to 300 Angstroms.
 29. Themethod of claim 27 comprising increasing degree of fluid permeability ofat least some of the fluid previous material from its as-depositedstate.
 30. The method of claim 27 comprising increasing, fromas-deposited state, degree of fluid permeability of first regions offluid previous material that are spaced farther from the sidewalls ascompared to second regions of fluid previous material that are spacedcloser to the sidewalls.
 31. The method of claim 30 wherein thecapacitor dielectric material blocks fluid permeability in at least amajority of the second regions but not in a majority of the firstregions.
 32. The method of claim 27 wherein the fluid previous materialcomprises a cellular solid.
 33. The method of claim 27 wherein the fluidprevious material comprises nanowhiskers.
 34. The method of claim 27wherein the fluid previous material comprises nanotubes.
 35. A method offarming a plurality of capacitors, comprising: depositing a firstmaterial over a substrate; depositing a fluid previous material havingplural fluid passageways over the first material, the first materialbeing selectively etchable relative to the fluid previous material;forming a plurality of spaced capacitor electrode openings into thefirst and fluid previous materials; forming a plurality of capacitorelectrodes within the openings; after forming the plurality of capacitorelectrodes, flowing an etching fluid through the fluid previous materialeffective to selectively etch first material relative to the fluidprevious material and effective to expose outer lateral sidewalls of thecapacitor electrodes below the fluid previous material; and after theselective etch, depositing capacitor dielectric material and capacitorelectrode material over at least some of the outer lateral sidewallsbelow the fluid previous material exposed by the selective etch.
 36. Themethod of claim 35 wherein the fluid previous material supports thecapacitor electrodes upright during said selective etch.
 37. The methodof claim 35 wherein the fluid impervious material is inherently fluidprevious as-deposited.
 38. The method of claim 37 comprising increasingdegree of fluid permeability of at least some of the fluid previousmaterial from its as-deposited state.
 39. The method of claim 35comprising after forming the plurality of capacitors increasing, fromas-deposited state, degree of fluid permeability of first regions offluid previous material that are spaced farther from the sidewalls ascompared to second regions of fluid previous material that are spacedcloser to the sidewalls.
 40. The method of claim 39 wherein thecapacitor dielectric material deposits onto the fluid previous material,the capacitor dielectric material blocking fluid permeability in atleast a majority of the second regions but not In a majority of thefirst regions.
 41. The method of claim 35 wherein at least a majority ofthe fluid passageways within the fluid previous material have averageopen cross sectional dimensions no greater than 400 Angstroms.
 42. Themethod of claim 35 wherein at least a majority of the fluid passagewayswithin the fluid previous material have average open cross sectionaldimensions no greater than 200 Angstroms.
 43. The method of claim 35wherein the fluid previous material remains as part of a finishedintegrated circuitry construction incorporating the plurality ofcapacitors.
 44. The method of claim 35 wherein the fluid previousmaterial comprises a cellular solid.
 45. The method of claim 44 whereinthe cellular solid comprises a honeycomb.
 46. The method of claim 44wherein the cellular solid comprises a foam.
 47. The method of claim 35wherein the fluid perilous material is porous.
 48. The method of claim47 wherein the fluid perilous material is nanoporous.
 49. The method ofclaim 47 wherein the fluid previous material is low k.
 50. The method ofclaim 35 wherein the fluid previous material comprises nanowhiskers. 51.The method of claim 35 wherein the fluid previous material comprisesnanotubes.
 52. The method of claim 35 wherein the depositing of thefluid previous material comprises: providing nanowhiskers within aspin-on-glass solution; depositing the solution over the first material;and solidifying the solution into material comprising spin-on-glass andnanowhiskers.
 53. The method of claim 35 wherein the depositing of thefluid previous material comprises: providing nanotubes within aspin-on-glass solution; depositing the solution over the first material;and solidifying the solution into material comprising spin-on-glass andnanotubes.
 54. A method of forming a plurality of capacitors,comprising: depositing a first material over a substrate; depositing afluid previous material having plural fluid passageways over the firstmaterial, the first material being selectively etchable relative to thefluid previous material; depositing a second material over the fluidprevious material, the second material being selectively etchablerelative to the fluid previous material; forming a plurality of spacedcapacitor electrode openings into the first, fluid previous, and secondmaterials; forming a plurality of capacitor electrodes within theopenings; after forming the plurality of capacitor electrodes, etchingthe second material selectively relative to the fluid previous materialeffective to expose outer lateral sidewalls of the capacitor electrodesabove the fluid previous material; after etching the second material,flowing an etching fluid through the fluid previous material effectiveto selectively etch first material relative to the fluid previousmaterial and effective to expose outer lateral sidewalls of thecapacitor electrodes below the fluid previous material; and after theselective etch of the first material, depositing capacitor dielectricmaterial and capacitor electrode material over at least some of theouter lateral sidewalls above and below the fluid previous material. 55.The method of claim 54 wherein the first and second materials aredifferent.
 56. The method of claim 55 wherein the first and secondmaterials comprise oxides.
 57. The method of claim 54 wherein the firstand second materials are the same.
 58. The method of claim 54 whereinthe second and first materials are selectively etched relative to thefluid previous material using the same etching fluid.
 59. The method ofclaim 54 wherein the second and first materials are selectively etchedrelative to the fluid previous material using the same etching fluid andin a single common, continuous etching step.
 60. The method of claim 54wherein the fluid perilous material supports the capacitor electrodesupright during said selective etch of the first material.
 61. The methodof claim 54 wherein the fluid previous material comprises a cellularsolid.
 62. The method of claim 61 wherein the cellular solid comprises ahoneycomb.
 63. The method of claim 61 wherein the cellular solidcomprises a foam.
 64. The method of claim 54 wherein the fluid previousmaterial is porous.
 65. The method of claim 64 wherein the fluidprevious material is nanoporous.
 66. The method of claim 64 wherein thefluid previous material is low k.
 67. The method of claim 54 wherein thefluid previous material comprises nanowhiskers.
 68. The method of claim54 wherein the fluid previous material comprises nanotubes.
 69. Themethod of claim 54 wherein the depositing of the fluid previous materialcomprises: providing nanowhiskers within a spin-on-glass solution;depositing the solution over the first material; and solidifying thesolution into material comprising spin-on-glass and nanowhiskers. 70.The method of claim 54 wherein the depositing of the fluid previousmaterial comprises: providing nanotubes within a spin-on-glass solution;depositing the solution over the first material; and solidifying thesolution into material comprising spin-on-glass and nanotubes.
 71. Themethod of claim 54 wherein the fluid impervious material is inherentlyfluid previous as-deposited.
 72. The method of claim 71 comprisingincreasing degree of fluid permeability of at least some of the fluidprevious material from its as-deposited state.
 73. The method of claim54 comprising after forming the plurality of capacitors increasing, fromas-deposited state, degree of fluid permeability of first regions offluid previous material that are spaced farther from the sidewalls ascompared to second regions of fluid previous material that are spacedcloser to the sidewalls.
 74. The method of claim 73 wherein thecapacitor dielectric material deposits onto the fluid previous material,the capacitor dielectric material blocking fluid permeability in atleast a majority of the second regions but not in a majority of thefirst regions.
 75. The method of claim 54 wherein at least a majority ofthe fluid passageways within the fluid previous material have averageopen cross sectional dimensions no greater than 400 Angstroms.
 76. Themethod of claim 54 wherein at least a majority of the fluid passagewayswithin the fluid previous material have average open cross sectionaldimensions no greater than 200 Angstroms.
 77. The method of claim 54wherein the fluid previous material remains as part of a finishedintegrated circuitry construction incorporating the plurality ofcapacitors.
 78. The method of claim 54 wherein the second material isdeposited on the fluid previous material, the second material filling atleast a portion of at least some of fluid passageways of the fluidprevious material.
 79. The method of claim 78 wherein the secondmaterial fills all of at least some of the fluid passageways of thefluid previous material.
 80. The method of claim 79 wherein the secondmaterial fills all of at least a majority of the fluid passageways ofthe fluid previous material.
 81. A method of forming a plurality ofcapacitors comprising: depositing a first material over a substrate;depositing a support material comprising at least one of nanotubes andnanowhiskers over the first material, the first material beingselectively etchable relative to the support material; forming aplurality of spaced capacitor electrode openings into the first andsupport materials; forming a plurality of capacitor electrodes withinthe openings; after forming the plurality of capacitor electrodes,etching the first material selectively relative to the support materialeffective to expose outer lateral sidewalls of the capacitor electrodesbelow the support material and leaving at least some of said supportmaterial at least in part supporting said plurality of capacitors; andafter said etching, depositing capacitor dielectric material andcapacitor electrode material over at least some of the outer lateralsidewalls below the support material exposed by said etching.
 82. Amethod of forming a plurality of capacitors, comprising: depositing afirst material over a substrate; depositing a support materialcomprising at least one nanotubes and nanowhiskers over the firstmaterial, the first material being selectively etchable relative to thesupport material; depositing a second material over the supportmaterial, the second material being selectively etchable relative to thesupport material; forming a plurality of spaced capacitor electrodeopenings into the first, support, and second materials; forming aplurality of capacitor electrodes within the openings; after forming theplurality of capacitor electrodes, etching the second materialselectively relative to the support material effective to expose outerlateral sidewalls of said plurality of capacitor electrodes above thesupport material; after etching the second material, etching the firstmaterial selectively relative to the support material effective toexpose outer lateral sidewalls of said plurality of capacitor electrodesbelow the support material and leaving at least some of said supportmaterial at least in part supporting said plurality of capacitorelectrodes; and after said etching of the first material, depositingcapacitor dielectric material and capacitor electrode material below thesupport material over at least some of the outer lateral sidewallsexposed by said etching of the first material.